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A140307 Number of n X n binary matrices containing at most four 1's in any 3 X 3 sub-block. 0
1, 2, 16, 256, 15982, 3082378, 1476568000, 2280441045555, 10599616558936358, 140380164790852384033 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..9.

CROSSREFS

Cf. A139810.

Sequence in context: A019318 A090727 A108242 * A114039 A090305 A246739

Adjacent sequences:  A140304 A140305 A140306 * A140308 A140309 A140310

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 27 2008

STATUS

approved

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Last modified June 5 18:48 EDT 2020. Contains 334854 sequences. (Running on oeis4.)